Clear-Com KB-702GM User manual

Brand: Clear-Com

Model: KB-702GM

Category: Audio equalizers

Type: User manual

This manual is also suitable for

KB-702

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

INSTRUCTION MANUAL

CLEAR-COM ENCORE

KB-702/KB-702GM Two-Channel Speaker Stations Instruction Manual

Part Number 810492Z Rev. 2

Vitec Group Communications, LLC.

850 Marina Village Parkway

Alameda, CA 94501

U.S.A

Vitec Group Communications

7400 Beach Drive

Cambridge Research Park

Cambridgeshire

United Kingdom

CB25 9TP

Vitec Group Communications

Room 1806, Hua Bin Building

No. 8 Yong An Dong Li

Jian Guo Men Wai Ave

Chao Yang District

Beijing, P.R. China 100022

Clear-Com is a registered trademark of Vitec Group Communications.

The Clear-Com Logo is a registered trademark of Vitec Group Communications.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

CONTENTS

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Internal Adjustments and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Block Diagram for the KB-702 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Block Diagram for the KB-702GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

KB-702/KB-702GM Two-Channel Speaker Stations. . . . . . . . . . . . . . . . . . . 4-1

LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-I

Warranty Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Non-Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

Liability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

iii

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the

manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves,

or other apparatus (including amplifiers) that produce heat.

9. Only use attachments/accessories specified by the manufacturer.

10. Use only with the cart, stand, tripod, bracket, or table specified by the

manufacturer, or sold with the apparatus. When a cart is used, use caution

when moving the cart/apparatus combination to avoid injury from tip-over.

11. Unplug this apparatus during lightning storms or when unused for long

periods of time.

12. Refer all servicing to qualified service personnel. Servicing is required when

the apparatus has been damaged in any way, such as power-supply cord or

plug is damaged, liquid has been spilled or objects have fallen into the

apparatus, the apparatus has been exposed to rain or moisture, does not

operate normally, or has been dropped.

13. WARNING: To reduce the risk of fire or electric shock, do not expose this

product to rain or moisture.

Please familiarize yourself with the safety symbols in Figure 1. When you see

these symbols on this product, they warn you of the potential danger of electric

shock if the station is used improperly. They also refer you to important

operating and maintenance instructions in the manual.

Please read and follow these

instructions before operating

this product.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

Figure 1: Safety Symbols

EMC AND SAFETY

The KB-702 and KB-702GM stations meet all relevant CE and FCC

specifications set out below:

EN55103-1 Electromagnetic compatibility. Product family standard for audio,

video, audio-visual, and entertainment lighting control apparatus for

professional use. Part 1: Emissions.

EN55103-2 Electromagnetic compatibility. Product family standard for audio,

video, audio-visual, and entertainment lighting control apparatus for

professional use. Part 2: Immunity.

And thereby compliance with the requirement of Electromagnetic

Compatibility Directive 2004/108/EC and Low Voltage Directive 2006/95/EC

This device complies with Part 15 of the FCC Rules. Operation is subject to

the following two conditions: (1) this device may not cause harmful

interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This symbol alerts you to the presence of uninsulated dangerous

voltage within the product's enclosure that might be of sufficient

magnitude to constitute a risk of electric shock. Do not open

the product's case.

This symbol informs you that important operating and main-

tenance instructions are included in the literature accompanying

this product.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-1

OPERATION

INTRODUCTION

Congratulations and thank you for choosing this Clear-Com product. The

KB-702 and KB-702GM two-channel speaker stations are powerful,

user-friendly units that can serve as versatile intercom stations.

Please read this manual completely to better understand the functions of these

products. For questions not addressed in this manual, contact the dealer or

Clear-Com directly. Clear-Com applications support and service people are ready

to help.

DESCRIPTION

The Clear-Com KB-702 is a two-channel speaker station ideal for theatre, live

performances, industrial applications, and small TV facilities. It features excellent

speech intelligibility even in high-noise environments and can be tailored to your

needs through its programmable options.

In addition, the Clear-Com KB-702GM contains a jack for an optional

Clear-Com gooseneck panel microphone and a close-in, voice-controlled circuit

(VOX). This circuit allows automatic, alternate dipping of the panel microphone

and the speaker in response to conversation.

Selectable two-channel talking and/or listening allows the operator to

communicate on either of the intercom channels. The dual-action talk button is

electronic momentary or latching. Monitoring can be done through the headset,

the integral speaker, or both at once. The KB-702 offers both visual and audible

call signaling to attract the attention of operators. The remote mic kill (RMK)

feature on main stations will turn off any open mics on the KB-702.

A balanced program input allows the monitoring of external audio using the

headset or speaker. This program input can also be used as a paging function.

The KB-702 speaker station accepts dynamic headsets. A sidetone control allows

the operator to vary the level of his/her own voice as heard in the headset and

speaker.

The integral speaker can be turned on or off by a convenient front panel switch.

An automatic speaker dipping circuit will lower the level of the speaker whenever

the talk button is activated. This feature helps minimize acoustical feedback.

The KB-702 receives power from the Clear-Com intercom line. The unit

mounts either in a standard four-gang electrical outlet box or in an optional

Clear-Com four-gang V-box. The extra-thick front panel and compact

surface-mount circuitry maintains legendary Clear-Com ruggedness. The two

intercom channels connect to a plug-on screw terminal strip. Male and female

3-pin XLR connectors are provided on the four-gang V-box for an inline

connection to one of the intercom channels.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-2

The optional EB7-TW daughter board module can be installed to provide an

interface to two intercom channels on a single microphone cable. Also, the

EB7-4W four-wire daughter board module is available to allow long-distance

connections using separate pairs of wire for send audio and receive audio. The

EB7-4W four-wire option supports two-channel operation.

The KB-702 and KB-702GM are compatible with all Clear-Com party-line

intercoms.

OPERATION

Normal operation of the KB-702 speaker station requires access only to the front

panel controls. The controls located elsewhere on the unit are intended to be

set-and-forget in nature. For intercom operation, set the listen level control to the

desired level and press the talk button when talking. If a headset or handset is

used, set the sidetone control for each channel for the desired amount of sidetone

in the earphone. If a hand-held push-to-talk mic is used, or if the panel mic is

used on the KB-702GM, set the sidetone controls for minimum feed-through to

the speaker to prevent acoustic feedback.

FRONT PANEL

The controls, indicators, and connectors found on the KB-702 and KB-702GM

front panels are shown in the following figures and are described by the following

text. The numbers in the left column refer to Figure 1-1 and Figure 1-2.

Figure 1-1: KB-702 Front Panel

Speaker

Program Level

Off On

Channel Select

KB-702

Call

Talk

Sidetone

Headset

Volume

2-Channel

Speaker Station

7610

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-3

Figure 1-2: KB-702GM Front Panel

1. Talk Button and Indicator: The talk button activates the microphone feed

to the selected intercom channel. It has a dual action (momentary or latching)

depending upon how the button is pressed. If desired, the latching function

can be defeated using an internal option switch. The following describes the

various functions of this button.

• MOMENTARY: Press and hold the talk button while you are speaking.

Release it when you are finished. The button lights amber when the talk

function is active and blue when it is inactive.

• LATCHING: Press the button quickly to latch the talk function. Press

the button again to turn off the talk function.

• VOX INDICATION: On the KB-702GM, when the VOX feature is

enabled, the talk button illuminates amber to indicate an active talk, and

the VOX light illuminates amber to indicate that the panel microphone

is in use. This will automatically dip the speaker.

2. Call Button and Light: Pressing the call button will send a call signal on the

selected channel. All the call lights on that channel will then flash. Call

signals can also be sent while talking if required. The call button will light

when pressed, or whenever a call signal is present on the selected channel. An

internal option jumper can be set to allow the call button to light when a call

signal is present on either channel.

3. Tone Alert: An audible tone alert can be enabled to sound when a call signal

is received on the selected channel or either channel. This can be useful when

the operator’s attention has been drawn away from the KB-702 indicator

panel. The audible tone alert level can be adjusted or turned off by an

internal control. The tone alert will not sound if a call signal originates at the

KB-702 station or if the speaker on/off switch is turned off. The tone alert

Speaker

Program Level

Off On

Channel Select

KB-702GM

Call

Talk

Sidetone

Headset

Panel Mic

VOX

Headset

Volume

Microphone

2-Channel

Speaker Station

1211

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-4

plays through both the speaker and headset if the speaker on/off switch is

turned on.

4. Volume Control: Turn this control to set the volume required on the speaker

or headset. This control does not affect the tone alert level or the program

input level.

5. Sidetone Control: Sidetone is the level of your own voice that you hear while

talking on the intercom. Setting a comfortable level of sidetone will ensure

that the intercom line sounds alive and also helps you modulate your voice

relative to other voices on the line.

Typically, different sidetone null settings are needed depending upon whether

you are using the speaker. Use one of the following procedures to correctly

set the sidetone level control.

Sidetone Adjustment Procedure for Headset:

1. Set the intercom level control to a comfortable level by having someone

talk to you from another station.

2. Press the talk button and speak into the microphone while turning the

sidetone null control slowly back and forth until you hear your voice at a

comfortable level in the headset.

Sidetone Adjustment Procedure for Gooseneck Mic (KB-702GM only) or

hand-held push-to-talk mic with the speaker turned on:

1. Set the VOX control fully counterclockwise to disable this feature.

2. Set the intercom level control to a comfortable level.

3. Press the talk button and speak into the microphone while turning the

sidetone null control slowly back and forth. There should be a point

where your voice (and any accompanying acoustic feedback) disappears.

This is the null point.

4. Readjust the VOX control. (Refer to the VOX control paragraph in this

section.)

6. Program Level Control: Adjust the program level control to set the program

audio level heard in the headset or panel speaker.

Note: Do not force the trimpots past their stop points. This will damage

them.

7. Speaker On/Off Switch: The speaker on/off switch turns the front panel

speaker on or off. This switch also controls whether the tone alert is heard

through the speaker. The speaker volume will automatically dip whenever

the talk function is set, unless the VOX function is disabled.

8. Mic Select Switch (KB-702GM only): The mic select switch selects whether

the panel microphone or the headset microphone is active. If the VOX

feature is enabled, it is only operational when the panel microphone is active.

9. Channel Switch: This switch selects whether the speaker station is active on

intercom channel A or channel B.

10. Headset Connector: The headset connector is located on the front panel. All

Clear-Com headsets are recommended for use with the KB-702. The

Clear-Com handheld push-to-talk microphone will also plug into the

headset connector. The following is a description of the characteristics of a

suitable headset:

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-5

Mic Type --- Dynamic; see technical specifications for details

Headphone --- Dynamic; see technical specifications for details

The wiring of the headset is to be as follows:

Pin 1 --- Mic common

Pin 2 --- Mic hot

Pin 3 --- Headphone common

Pin 4 --- Headphone hot

The mic and headphone wiring in the headset cord must be individually

shielded. Do not connect pins #1 and #3 together. Headset extension cords

or headset “Y” cables are not recommended because they will increase

crosstalk between channels.

11. Panel Mic Connector (KB-702GM only): Clear-Com recommends the

GM-9 and GM-18 plug-in panel microphones for use with the KB-702GM.

The GM-9 is 9 in. (23.04 cm) long and the GM-18 is 18 in. (46.08 cm)

long. Both are the electret type. The 1/4 in. (0.64 cm)phone jack on the

microphone mates with the panel mic receptacle on the front panel of the

KB-702GM.

To install a GM-9 or GM-18 microphone, use the following steps:

1. Remove the plastic plug from the jack, if present.

2. Check and unscrew the set screw in the mic mounting flange to make

sure it is clear of the threads in the bushing.

3. Screw the microphone into the bushing hand tight.

4. Turn the set screw on top of the mic mounting flange clockwise to lock

the microphone in place.

12. VOX Control (KB-702GM only): When the panel microphone is selected

on the KB-702GM, the VOX control should be adjusted for proper

operation. This control is located to the right of the panel mic connector.

Use a narrow flat blade screwdriver such as a greenie or tweaker for this

adjustment. When the adjustment is correctly set, the VOX light illuminates

amber when speaking into the panel microphone. Turning the control

clockwise makes the KB-702GM more sensitive to your voice. The VOX

feature can be disabled by turning the VOX control fully counterclockwise.

INTERNAL ADJUSTMENTS AND CONNECTIONS

The controls and connectors found inside the KB-702 are shown in the

following figure and described by the following text. The controls can be

accessed without completely removing the panel from its wall box or V-Box

enclosure by removing the top two screws and loosening the bottom two screws a

few turns. Then lean the panel out from the wall. The controls will then be

accessible as shown in the lower view of Figure 1-3. The numbers in the left

column of the following descriptions refer to Figure 1-3.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-6

Figure 1-3: Internal Adjustments and Connections

13. Call Alert Tone Level Control: This control adjusts the volume of the call

alert tone sound. This is normally adjusted when the system is set up and

there should be no need to adjust it in normal operation. This feature can be

disabled by turning the control fully counterclockwise.

14. Option Switches: Three option switches are provided. They should be

configured when the system is set up, but are not changed in normal

operation. Note the on position of each switch is toward the circuit board

and the off position is toward the front panel. The default position of the

switches is in the off position. The function of each switch is as follows:

1. SINGLE CHANNEL: In some installations, the KB-702 is intended to

be used only with one intercom channel. Setting the single channel

switch to the on position will connect the KB-702 to the one intercom

channel regardless of the position of the front panel channel selector. In

two-channel installations, this switch must be set to the off position.

2. LONG LINE: If a long cable run is unavoidable and approaches

700 ft. (213.5 m) or more, set the long line option switch to the on

position. The ability to set a sidetone null depends upon properly setting

this switch.

3. LATCH DISABLE: Setting the latch disable switch to the on position

will disable the latching function of the talk button. In this mode, the

talk button must be continuously pressed while the operator is talking.

15. Call Signal Jumper: In some installations it is important to receive a call

signal from either channel, regardless of the setting of the channel selector.

The plug-on jumper P1 makes the call light respond to either (a) the selected

channel or to (b)either channel, depending upon its orientation. By default,

the jumper is set to the selected channel position. When the TW or 4-Wire

P1 Call

on Both

P1 Call on

Selected

P3 Must be

installed if

no option

P2 Must be

installed if

no option

1 2 3

15 16

1413

View from top

of KB-702

Front Panel

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-7

Option modules are installed, this jumper is not used. In TW operation, the

call signal always originates on channel A. In 4-Wire operation, the call

signal is not used.

16. Intercom Line Connection: The KB-702 contains a 5-terminal plug-on

connector for intercom line connection. This connector is intended to be

unplugged from the circuit board when connecting the intercom line, and

then plugged back on when the wiring is completed. The connections for

each pin are visible on the circuit board when the connector is unplugged.

The pinout of this connector is as follows:

Pin 1 --- (NC)

Pin 2 --- Channel A Audio

Pin 3 --- Channel B Audio

Pin 4 --- Power

Pin 5 --- Ground (Shield)

Figure 1-4: One-Channel Cable Wiring

Figure 1-5: Two-Channel Cable Wiring

17. Program Input: A 3-terminal plug-on connector provides the program input

to the station. Program is fed to the headset and speaker. The level to the

One Channel

Cable Wiring:

KB-702 Intercom

Connector

XLR

Connector

Channel A

Pin 1

Pin 5

Two Channel

Cable Wiring

KB-702 Intercom

Connector

XLR

Connectors

Channel A

Channel B

Pin 1

Pin 5

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

1-8

speaker or headset is controlled by the program level control. The program

input accepts a balanced or unbalanced line-level audio signal. If this input is

connected to the stage announce (SA) output of a main station it can be used

as a paging input. Since the level of this input is independently adjustable

from the intercom audio volume, it can be used to override the intercom

audio.

The pinout of the program input connector is as follows:

Pin 1 --- Ground (shield)

Pin 2 --- + Signal

Pin 3 --- - Signal

Figure 1-6: Program-Input Cable Wiring

18. Option Board Jumpers: The three jumper plugs P1, P2, and P3 must be

installed when optional modules are not used. When the optional EB7-4W

four-wire or EB7-TW modules are used, both P1 and P3 must be removed.

In the KB-702GM, P2 is replaced by the VOX module. Save these jumper

plugs for possible future use after removing them. The KB-702 will not

operate without either these jumper plugs or the optional modules

installed.

Program Input

Cable Wiring

KB-702 Program

Input Connector

XLR

Connector

Pin 1

Pin 3

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

2-1

INSTALLATION

1. Unpack the unit and inspect for any damage that may have occurred in

shipping.

2. Set the option switches to the default (up) position.

3. Connect the intercom lines. If only one intercom line is to be connected,

turn option switch #1 to the on or closed position.

4. Install the KB-702 into the four-gang outlet box or V-box. (For additional

information, refer to the Clear-Com System Installation Manual.)

5. Set listen levels and sidetones. (Refer to the listen level and sidetone setting

topics in the Operation chapter of this manual.)

6. The speaker station should now be operating properly.

7. Read the rest of this manual for further information.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

2-2

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

3-1

MAINTENANCE

This chapter provides maintenance information including block diagrams and tips for solving problems.

Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not

perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

BLOCK DIAGRAM FOR THE KB-702

Figure 3-7: KB-702 Block Diagram

EQ/

LIM

Headset

Mic

Talk

Sidetone

Null

Call

Light

Call

Intercom

Volume

Speaker

On/Off

TW Option

Channel

Switch

Ch. A

Speaker

Power

Ch. B

Call Send &

Receive

RMK

Microprocessor

Talk

Headset

Output

Balanced

Program

Input

Speaker

Dip

Program

Mute

Mic

Mute

Common

+30 VDC

Ground

Latch

Disable

Long Line

Program

Level

Call Alert

Tone Level

4-Wire

Input

4-Wire

Output

2-Wire / 4-Wire

Select

Rectifier

16 VAC

Power

Ch. B

Ch. A

4-Wire

Option

Single

Chan.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

3-2

BLOCK DIAGRAM FOR THE KB-702GM

Figure 3-8: KB-702GM Block Diagram

EQ/

LIM

Mic Select

Headset

Mic

Panel

Mic

Talk

Sidetone

Null

Call

Light

Call

Intercom

Volume

Red /

Green

Speaker

On/Off

TW Option

Channel

Switch

Ch. A

Speaker

Power

Ch. B

Call Send &

Receive

RMK

Microprocessor

Talk/

VOX

Headset

Output

Balanced

Program

Input

Speaker

Dip

Program

Mute

Mic Dip /

Mute

VOX

Common

+30 VDC

Ground

Latch

Disable

Long Line

Program

Level

Call Alert

Tone Level

4-Wire

Input

4-Wire

Output

2-Wire / 4-Wire

Select

Rectifier

16 VAC

Power

Ch. B

Ch. A

4-Wire

Option

Single

Chan.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

3-3

TROUBLESHOOTING

SYMPTOM CAUSE SOLUTION

System does not operate. Ta l k

button does not light.

No intercom connection to the

KB-702. If the EB7-4W four-wire

option module is connected, the

KB-702 may not be receiving AC

power.

Check connections and cable.

The KB-702 has an internal failure. Unit requires servicing.

Speaker does not operate. Ta l k

button lights amber when

pressed.

Speaker switch turned off, volume

knob turned all the way down, or

channel switch set to unused channel.

Adjust controls appropriately.

Speaker plug or wiring has come loose. Make sure speaker is connected

internally.

Plug P3 missing on circuit board. Plug P3 must be installed in jack J3 if

the EB-TW or EB7-4W options are

not used.

Hum or buzz in system Inductive pickup caused by close

proximity of this speaker station or

connected stations to power lines or

transformers.

Relocate the offending unit or wiring.

If the cable run is exceptionally long,

consider adding and using the

EB7-4W four-wire option module.

(Requires an additional four-wire

interface at the opposite end of the

“long run.”)

System feedback (Acoustical) Intercom level control at this station or

another station is set too high.

Adjust.

Sidetone null control at this station or

another station is not adjusted

correctly.

Adjust. Refer to the chapter

“Operation.”

Channel not terminated. Set the main station or power supply

termination switch for that channel to

the on position.

Channel switch set to an unconnected

channel.

If only one intercom line is connected,

set option switch #1 to the on or closed

position to link both channel switch

positions to the same intercom line.

A headset extension cord was used. Headset extension cords are not

recommended.

VOX problems (KB-702GM

only)

Stays tripped (amber light on).

Sensitivity set too high.

Tu r n VOX sensitivity control in a

counter-clockwise direction.

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

3-4

Will not trip with voice. Sensitivity set

too low.

Tu r n VOX sensitivity control in a

clockwise direction.

Note: VOX is intended for close-in

operation.

Excessive crosstalk High DC resistance has a ground

return.

Use heavier cable; add additional

conductor(s) to ground return. If the

cable run is exceptionally long,

consider adding and using the

EB7-4W four-wire option module.

Multi-channel cable pairs are not

individually shielded.

Replace cable with individually

shielded pairs.

Headset cables are not wired properly

or shielded properly.

Correct wiring. Use headsets with

properly shielded wiring. Refer to the

chapter “Operation.”

Program signal sounds distorted. Program level control set too high. Turn the program level control

counter-clockwise.

Overload of program input circuit. Reduce the gain of the program signal

at the source, such as an audio mixer.

Call signal does not function. Excessive DC loading of intercom

line.

Remove any audio transformers or

other equipment that may be

connected across the intercom line. If

equipment other than Clear-Com

intercom equipment must be

connected to the intercom line, please

contact Clear-Com application or

service personnel for information or

recommendations.

Far too many terminations on the

intercom line.

Check all main stations and power

supplies to make sure each intercom

channel is terminated at only one

point.

Plug P1 missing on circuit board. Plug P1 must be installed in jack J1 if

the EB7-4W or EB7-TW options are

not used.

SYMPTOM CAUSE SOLUTION

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Clear-Com KB-702GM User manual

Brand: Clear-Com

Model: KB-702GM

Category: Audio equalizers

Type: User manual

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KB-702

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Clear-Com KB-702GM User manual

This manual is also suitable for

Clear-Com KB-702GM User manual

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